Project 449: M. R. Stocker. 2010. A new taxon of phytosaur (Archosauria: Pseudosuchia) from the Late Triassic (Norian) Sonsela Member (Chinle Formation) in Arizona, and a critical reevaluation of Leptosuchus Case, 1922. Palaeontology. 53 (5):997-1022.
Abstract
Leptosuchus Case 1922 (Reptilia: Phytosauria) from the Late Triassic of the American West is represented by many specimens. Here, I present complete morphological descriptions of the skull material of a new taxon from the Sonsela Member (Chinle Formation) of Petrified Forest National Park, Arizona, with the first rigorous phylogenetic analysis focused on the interrelationships of Leptosuchus. The new taxon is recovered as the sister taxon to Pseudopalatinae. It possesses one unambiguous synapomorphy (the ‘septomaxillae’ form part of the lateral borders of the nares) and shares the presence of a subsidiary opisthotic process with Pseudopalatinae. The new taxon does not fall within the restricted clade Leptosuchus. In my analysis, the previously proposed, but undemonstrated, sister taxon relationship between Angistorhinus and Rutiodon is not supported, Paleorhinus is recovered as paraphyletic, and a subset of taxa traditionally included within Leptosuchus are found to be more closely related to Pseudopalatinae, rendering Leptosuchus paraphyletic. ‘Leptosuchus’ adamanensis emerges as sister taxon to Smilosuchus gregorii and is here referred to as Smilosuchus adamanensis nov. comb., and ‘Machaeroprosopus’ lithodendrorum is also transferred to Smilosuchus lithodendrorum nov. comb.. Documentation of the variation present within Phytosauria, and specifically within Leptosuchus sensu lato, demonstrates higher diversity within Phytosauria than previously appreciated and places the character states previously proposed for Pseudopalatinae into a broader context of shared characters.Read the article »
Article DOI: 10.1111/j.1475-4983.2010.00983.x
Project DOI: 10.7934/P449, http://dx.doi.org/10.7934/P449
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 766 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 43 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 105 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:43/0 |
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MorphoBank Project 449
MorphoBank Project 449
- Creation Date:
09 December 2010 - Publication Date:
14 October 2014 - Project views: 30883
- Matrix downloads: 5
Authors' Institutions
- University of Texas at Austin
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Michelle Stocker Project Administrator | 24 | 0 | 1 | 43 | 0 | 0 | 766 (766, 0, 0) | 0 | 0 | 0 | ||||
MorphoBank Curator Full membership | 1 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M1029' (24 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Euparkeria capensis Last Modified in 10/16/14 | 8 | 35 | 35 | 0 | 0 | 0 | 0 | 2 |
[2] † Paleorhinus scurriensis Last Modified in 10/16/14 | 18 | 25 | 25 | 0 | 0 | 0 | 0 | 2 |
[3] † Paleorhinus bransoni Last Modified in 10/16/14 | 5 | 38 | 38 | 0 | 0 | 0 | 0 | 2 |
[4] † Paleorhinus sawini Last Modified in 10/16/14 | 13 | 30 | 30 | 0 | 0 | 0 | 0 | 2 |
[5] † Brachysuchus megalodon Last Modified in 10/16/14 | 10 | 33 | 33 | 0 | 0 | 0 | 0 | 2 |
[6] † Angistorhinus Last Modified in 10/16/14 | 10 | 33 | 33 | 0 | 0 | 0 | 0 | 2 |
[7] † Rutiodon carolinensis Last Modified in 10/17/14 | 12 | 31 | 31 | 0 | 0 | 0 | 0 | 2 |
[8] † Phytosaurus doughtyi Last Modified in 10/16/14 | 24 | 19 | 19 | 0 | 0 | 0 | 0 | 2 |
[9] † Leptosuchus crosbiensis Last Modified in 10/16/14 | 7 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[10] † Leptosuchus imperfecta Last Modified in 10/16/14 | 26 | 17 | 17 | 0 | 0 | 0 | 0 | 2 |
[11] † Leptosuchus studeri Last Modified in 10/16/14 | 4 | 39 | 39 | 0 | 0 | 0 | 0 | 2 |
[12] † Leptosuchus adamanensis Last Modified in 10/16/14 | 2 | 41 | 41 | 0 | 0 | 0 | 0 | 2 |
[13] † Machaeroprosopus lithodendrorum Last Modified in 10/16/14 | 10 | 33 | 33 | 0 | 0 | 0 | 0 | 2 |
[14] † Machaeroprosopus zunii Last Modified in 10/16/14 | 24 | 19 | 19 | 0 | 0 | 0 | 0 | 2 |
[15] † Smilosuchus gregorii Last Modified in 10/17/14 | 3 | 40 | 40 | 0 | 0 | 0 | 0 | 2 |
[16] PEFO 31218 Last Modified in 12/05/13 | 15 | 28 | 28 | 0 | 0 | 0 | 0 | 2 |
[17] † PEFO 34239 Last Modified in 10/17/14 | 18 | 25 | 25 | 0 | 0 | 0 | 0 | 2 |
[18] † AMNH fr 30646 Last Modified in 10/17/14 | 2 | 41 | 41 | 0 | 0 | 0 | 0 | 2 |
[19] † PEFO 34034 Last Modified in 10/17/14 | 17 | 26 | 26 | 0 | 0 | 0 | 0 | 2 |
[20] † Leptosuchomorpha Last Modified in 11/17/14 | 2 | 41 | 41 | 0 | 0 | 0 | 0 | 2 |
[21] † Pseudopalatus mccauleyi Last Modified in 10/17/14 | 3 | 40 | 40 | 0 | 0 | 0 | 0 | 2 |
[22] † Pseudopalatus pristinus Last Modified in 10/17/14 | 2 | 42 | 41 | 0 | 0 | 0 | 0 | 2 |
[23] † Mystriosuchus westphali Last Modified in 10/16/14 | 7 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[25] † Pseudopalatus jablonskiae Last Modified in 10/17/14 | 25 | 18 | 18 | 0 | 0 | 0 | 0 | 2 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 30883 | |
Project overview | 4377 | |
Media views | 7130 | Media search (6105 views); M346043 (1025 views); |
Matrix views | 3223 | Matrix landing page (2901 views); Pravusuchus phylogeny (322 views); |
Bibliography | 1456 | |
Taxon list | 12394 | |
Documents list | 2303 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 373 | |
Matrix downloads | 5 | Pravusuchus phylogeny (5 downloads); |
Document downloads | 1 | Phylogenetic Characters and Character States (1 download); |
Project downloads | 367 |